Final Copy Flashcards by Jass Minhas

Q

Regulator purpose?

A

Maintain constant outlet pressure

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Q

3 regulator elements?

A

Restricting measuring loading

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Q

Restricting element?

A

Valve/orifice

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Q

Measuring element?

A

Diaphragm

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Q

Loading element?

A

Spring/weight

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Q

Opening force?

A

Spring

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Q

Closing force?

A

Downstream pressure

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Q

Regulator flow direction?

A

Directional

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Q

Single diaphragm disadvantage?

A

Slow response

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Q

Orifice drilling rule?

A

Drill 2 sizes smaller first

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Q

NG BTU per ft³?

A

1000 BTU

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Q

Propane BTU per ft³?

A

2500 BTU

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Q

Propane manifold pressure?

A

11 in w.c.

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Q

Propane supply pressure?

A

11–14 in w.c.

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Q

Aerated burner?

A

Premixed air and gas

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Q

Non-aerated burner?

A

No premix

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Q

Too much primary air, what kind of flame ?

A

Oxidizing flame

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Q

Too little primary air?

A

Carburizing flame

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Q

Venturi purpose?

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A

Draws air

Q

Common oil fuel?

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A

No 2 oil

Q

Interrupted pilot?

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A

Lights then shuts off

Q

Intermittent pilot?

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A

Stays on during call

Q

Thermocouple closed mV?

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A

8–17 mV

Q

Thermocouple open mV?

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A

17–30 mV

Thermocouple dropout?

0.75–6 mV

Main vent parts?

Vent connector draft device

Natural draft created by?

Buoyancy

Condensation temperature?

126°F

Draft hood purpose?

Add dilution air

Category I vent?

Negative pressure

Category IV vent?

Positive pressure

B-vent clearance?

1 inch

C-vent clearance?

6 inches

Horizontal vent slope?

¼ in per ft

Dryer vent screws?

Not allowed

Wall pass-through?

Metal thimble

Hidden line shows?

Invisible edge

Cross hatching shows?

Cut surface

Isometric drawing?

3D view

Orthographic drawing?

2D multi-view

Defrost indoor blower?

ON

Defrost outdoor fan?

OFF

Defrost valve position?

Cooling

Heat pump types?

Air-air air-water ground

EES parts?

Heat pump and piping